Surface the IntelligibilityEnhancer on MediaConstraints

webrtc/modules/audio_device/include/audio_device.h

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 180 matching lines @@
   virtual bool BuiltInNSIsAvailable() const { return false; }
 
   // Enables the built-in audio effects. Only supported on Android.
   // TODO(henrika): Make pure virtual after updating Chromium.
   virtual int32_t EnableBuiltInAEC(bool enable) { return -1; }
   virtual int32_t EnableBuiltInAGC(bool enable) { return -1; }
   virtual int32_t EnableBuiltInNS(bool enable) { return -1; }
   // Don't use.
   virtual bool BuiltInAECIsEnabled() const { return false; }
 
+  virtual bool IntelligibilityIsEnabled() const { return false; }
+
   // Only supported on iOS.
   // TODO(henrika): Make pure virtual after updating Chromium.
   virtual int GetPlayoutAudioParameters(AudioParameters* params) const {
     return -1;
   }
   virtual int GetRecordAudioParameters(AudioParameters* params) const {
     return -1;
   }
 
  protected:
   virtual ~AudioDeviceModule() {}
 };
 
 }  // namespace webrtc
 
 #endif  // MODULES_AUDIO_DEVICE_INCLUDE_AUDIO_DEVICE_H_